====================================================== WARNING: possible circular locking dependency detected 6.4.0-rc5-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/16908 is trying to acquire lock: ffff88801246c068 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:142 [inline] ffff88801246c068 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault arch/x86/mm/fault.c:1391 [inline] ffff88801246c068 (&mm->mmap_lock){++++}-{3:3}, at: handle_page_fault arch/x86/mm/fault.c:1534 [inline] ffff88801246c068 (&mm->mmap_lock){++++}-{3:3}, at: exc_page_fault+0x6a8/0x910 arch/x86/mm/fault.c:1590 but task is already holding lock: ffff888019b2a0e0 (&sbi->s_lock){+.+.}-{3:3}, at: exfat_iterate+0x171/0x3370 fs/exfat/dir.c:232 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&sbi->s_lock){+.+.}-{3:3}: lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5705 __mutex_lock_common+0x1d8/0x2530 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799 exfat_get_block+0x1e5/0x2050 fs/exfat/inode.c:280 do_mpage_readpage+0x911/0x1fa0 fs/mpage.c:234 mpage_readahead+0x454/0x930 fs/mpage.c:382 read_pages+0x183/0x830 mm/readahead.c:161 page_cache_ra_unbounded+0x697/0x7c0 mm/readahead.c:270 page_cache_sync_readahead include/linux/pagemap.h:1211 [inline] filemap_get_pages+0x49c/0x20c0 mm/filemap.c:2595 filemap_read+0x45a/0x1170 mm/filemap.c:2690 __kernel_read+0x422/0x8a0 fs/read_write.c:428 integrity_kernel_read+0xb0/0xf0 security/integrity/iint.c:192 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:485 [inline] ima_calc_file_shash security/integrity/ima/ima_crypto.c:516 [inline] ima_calc_file_hash+0x1643/0x1d20 security/integrity/ima/ima_crypto.c:573 ima_collect_measurement+0x3a7/0x880 security/integrity/ima/ima_api.c:293 process_measurement+0xfdb/0x1ce0 security/integrity/ima/ima_main.c:341 ima_file_check+0xf1/0x170 security/integrity/ima/ima_main.c:539 do_open fs/namei.c:3638 [inline] path_openat+0x280a/0x3170 fs/namei.c:3791 do_filp_open+0x234/0x490 fs/namei.c:3818 do_sys_openat2+0x13f/0x500 fs/open.c:1356 do_sys_open fs/open.c:1372 [inline] __do_sys_open fs/open.c:1380 [inline] __se_sys_open fs/open.c:1376 [inline] __x64_sys_open+0x225/0x270 fs/open.c:1376 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #1 (mapping.invalidate_lock#16){.+.+}-{3:3}: lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5705 down_read+0x47/0x2f0 kernel/locking/rwsem.c:1520 filemap_invalidate_lock_shared include/linux/fs.h:830 [inline] filemap_fault+0x647/0x1810 mm/filemap.c:3271 __do_fault+0x136/0x500 mm/memory.c:4176 do_read_fault mm/memory.c:4530 [inline] do_fault mm/memory.c:4659 [inline] do_pte_missing mm/memory.c:3647 [inline] handle_pte_fault mm/memory.c:4947 [inline] __handle_mm_fault mm/memory.c:5089 [inline] handle_mm_fault+0x41a8/0x5860 mm/memory.c:5243 do_user_addr_fault arch/x86/mm/fault.c:1440 [inline] handle_page_fault arch/x86/mm/fault.c:1534 [inline] exc_page_fault+0x7d2/0x910 arch/x86/mm/fault.c:1590 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 strncpy_from_user+0x111/0x2e0 lib/strncpy_from_user.c:139 getname_flags+0xf9/0x4e0 fs/namei.c:151 getname fs/namei.c:219 [inline] __do_sys_mkdirat fs/namei.c:4153 [inline] __se_sys_mkdirat fs/namei.c:4151 [inline] __x64_sys_mkdirat+0x7c/0xa0 fs/namei.c:4151 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #0 (&mm->mmap_lock){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3113 [inline] check_prevs_add kernel/locking/lockdep.c:3232 [inline] validate_chain+0x166b/0x58f0 kernel/locking/lockdep.c:3847 __lock_acquire+0x1316/0x2070 kernel/locking/lockdep.c:5088 lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5705 down_read+0x47/0x2f0 kernel/locking/rwsem.c:1520 mmap_read_lock include/linux/mmap_lock.h:142 [inline] do_user_addr_fault arch/x86/mm/fault.c:1391 [inline] handle_page_fault arch/x86/mm/fault.c:1534 [inline] exc_page_fault+0x6a8/0x910 arch/x86/mm/fault.c:1590 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 filldir64+0x2a1/0x6a0 fs/readdir.c:331 dir_emit_dot include/linux/fs.h:3163 [inline] dir_emit_dots include/linux/fs.h:3174 [inline] exfat_iterate+0x2b8/0x3370 fs/exfat/dir.c:235 iterate_dir+0x228/0x570 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64+0x20d/0x4f0 fs/readdir.c:354 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd other info that might help us debug this: Chain exists of: &mm->mmap_lock --> mapping.invalidate_lock#16 --> &sbi->s_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sbi->s_lock); lock(mapping.invalidate_lock#16); lock(&sbi->s_lock); rlock(&mm->mmap_lock); *** DEADLOCK *** 3 locks held by syz-executor.3/16908: #0: ffff888017bd59e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x254/0x2f0 fs/file.c:1047 #1: ffff888037f67130 (&sb->s_type->i_mutex_key#26){++++}-{3:3}, at: iterate_dir+0x135/0x570 fs/readdir.c:57 #2: ffff888019b2a0e0 (&sbi->s_lock){+.+.}-{3:3}, at: exfat_iterate+0x171/0x3370 fs/exfat/dir.c:232 stack backtrace: CPU: 1 PID: 16908 Comm: syz-executor.3 Not tainted 6.4.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 check_noncircular+0x2fe/0x3b0 kernel/locking/lockdep.c:2188 check_prev_add kernel/locking/lockdep.c:3113 [inline] check_prevs_add kernel/locking/lockdep.c:3232 [inline] validate_chain+0x166b/0x58f0 kernel/locking/lockdep.c:3847 __lock_acquire+0x1316/0x2070 kernel/locking/lockdep.c:5088 lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5705 down_read+0x47/0x2f0 kernel/locking/rwsem.c:1520 mmap_read_lock include/linux/mmap_lock.h:142 [inline] do_user_addr_fault arch/x86/mm/fault.c:1391 [inline] handle_page_fault arch/x86/mm/fault.c:1534 [inline] exc_page_fault+0x6a8/0x910 arch/x86/mm/fault.c:1590 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0010:filldir64+0x2a1/0x6a0 fs/readdir.c:335 Code: 93 ff 4c 89 f7 48 89 de e8 9c 04 93 ff 49 01 df 0f 88 5a 02 00 00 49 39 df 0f 82 51 02 00 00 0f 01 cb 0f ae e8 48 8b 44 24 60 <48> 89 43 08 48 8b 4c 24 10 48 8b 44 24 58 48 89 01 48 8b 44 24 18 RSP: 0018:ffffc9000be676c0 EFLAGS: 00050206 RAX: 0000000000000000 RBX: 00000000200073c0 RCX: ffff88807e7c3b80 RDX: 0000000000000000 RSI: 00000000200073c0 RDI: 00000000200073d8 RBP: 0000000000000000 R08: ffffffff81f87ca4 R09: 0000000000000004 R10: 0000000000000003 R11: ffff88807e7c3b80 R12: ffffffff8aff11e0 R13: 0000000000000001 R14: 00000000200073d8 R15: 00000000200073d8 dir_emit_dot include/linux/fs.h:3163 [inline] dir_emit_dots include/linux/fs.h:3174 [inline] exfat_iterate+0x2b8/0x3370 fs/exfat/dir.c:235 iterate_dir+0x228/0x570 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64+0x20d/0x4f0 fs/readdir.c:354 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f0b4f28c169 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f0b45a1e168 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 00007f0b4f3ac050 RCX: 00007f0b4f28c169 RDX: 0000000000001000 RSI: 00000000200073c0 RDI: 000000000000000a RBP: 00007f0b4f2e7ca1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdb2bdfa7f R14: 00007f0b45a1e300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 93 xchg %eax,%ebx 1: ff 4c 89 f7 decl -0x9(%rcx,%rcx,4) 5: 48 89 de mov %rbx,%rsi 8: e8 9c 04 93 ff callq 0xff9304a9 d: 49 01 df add %rbx,%r15 10: 0f 88 5a 02 00 00 js 0x270 16: 49 39 df cmp %rbx,%r15 19: 0f 82 51 02 00 00 jb 0x270 1f: 0f 01 cb stac 22: 0f ae e8 lfence 25: 48 8b 44 24 60 mov 0x60(%rsp),%rax * 2a: 48 89 43 08 mov %rax,0x8(%rbx) <-- trapping instruction 2e: 48 8b 4c 24 10 mov 0x10(%rsp),%rcx 33: 48 8b 44 24 58 mov 0x58(%rsp),%rax 38: 48 89 01 mov %rax,(%rcx) 3b: 48 8b 44 24 18 mov 0x18(%rsp),%rax